A function \( f: \mathbf{Z} \rightarrow \mathbf{Z} \) is defined as... VIDEO
A function \( f: \mathbf{Z} \rightarrow \mathbf{Z} \) is defined as below:
\[
f(x)=\left\{\begin{array}{c}
x+3, \text { if } x \text { is odd } \\
\frac{x}{2}, \text { if } x \text { is even. }
\end{array}\right.
\]
If \( k \) is an odd integer and \( f[f(k+3)]=27 \), then the sum - of the digits of the number \( k \) equals :
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